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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4fe61039a1f3b8c0bef12ee27784852e034ba243a35d8bcb773d03c915232e9f' 
  AND token = '5kdHZRpazX+E1iaImnEwXlX/9N+e/WhJvOzeRdlNpXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}